LM334Z#PBF

Product Overview

Category: Integrated Circuits (ICs)

Use: The LM334Z#PBF is a precision three-terminal adjustable current source. It is designed to provide a constant current over a wide range of voltage and temperature variations.

Characteristics: - Adjustable output current - Wide operating voltage range - High accuracy and stability - Low power consumption - Temperature compensation

Package: TO-92 (Transistor Outline 92) package

Essence: The LM334Z#PBF is an essential component in various electronic circuits that require a stable and precise current source.

Packaging/Quantity: The LM334Z#PBF is typically available in reels or tubes, with quantities varying depending on the supplier.

Specifications

• Output Current Range: 1µA to 10mA
• Operating Voltage Range: 1V to 40V
• Temperature Coefficient: 0.33%/°C
• Power Dissipation: 500mW
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The LM334Z#PBF has three pins:

1. Anode (A): Connected to the positive terminal of the power supply.
2. Cathode (C): Connected to the load or circuit requiring a constant current.
3. Ref (R): Connected to a resistor to set the desired output current.

Functional Features

• Constant Current Source: The LM334Z#PBF maintains a constant current regardless of voltage and temperature changes.
• Adjustable Output: The output current can be easily adjusted by changing the value of the external resistor connected to the Ref pin.
• Temperature Compensation: The LM334Z#PBF incorporates temperature compensation to ensure accurate current regulation over a wide temperature range.

Advantages and Disadvantages

Advantages: - High precision and stability - Wide operating voltage range - Simple to use and adjust - Low power consumption

Disadvantages: - Limited output current range (1µA to 10mA) - Requires an external resistor for current adjustment

Working Principles

The LM334Z#PBF utilizes a bandgap reference circuit to generate a stable voltage across the Ref pin. This voltage is then used to regulate the current flowing through the Cathode pin. The device compensates for temperature variations by adjusting the voltage drop across the Ref pin, ensuring a constant current output.

Detailed Application Field Plans

The LM334Z#PBF finds applications in various fields, including:

1. LED Lighting: It can be used as a current source for driving LEDs, ensuring consistent brightness and preventing damage due to overcurrent.
2. Battery Charging: The LM334Z#PBF can be employed in battery charging circuits to provide a controlled charging current, preventing overcharging and extending battery life.
3. Sensor Biasing: It is suitable for biasing sensors that require a precise and stable current supply, such as photodiodes and temperature sensors.
4. Analog Circuits: The LM334Z#PBF can be utilized in analog circuits that require a stable current reference, such as current mirrors and current sources.

Detailed and Complete Alternative Models

Some alternative models to the LM334Z#PBF include:

1. LM134: Similar functionality with a lower operating voltage range.
2. LM336: Provides a fixed output voltage instead of a current source.
3. LT3092: Offers higher output current capability and additional features like thermal shutdown protection.

These alternatives can be considered based on specific requirements and application needs.

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